68979257 has 2 divisors, whose sum is σ = 68979258. Its totient is φ = 68979256.

The previous prime is 68979241. The next prime is 68979271. The reversal of 68979257 is 75297986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 18696976 = 7091^2 + 4324^2 .

It is a cyclic number.

It is not a de Polignac number, because 68979257 - 2⁴ = 68979241 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68979199 and 68979208.

It is not a weakly prime, because it can be changed into another prime (68973257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34489628 + 34489629.

It is an arithmetic number, because the mean of its divisors is an integer number (34489629).

Almost surely, 2^68979257 is an apocalyptic number.

It is an amenable number.

68979257 is a deficient number, since it is larger than the sum of its proper divisors (1).

68979257 is an equidigital number, since it uses as much as digits as its factorization.

68979257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 53.

The square root of 68979257 is about 8305.3751871905. The cubic root of 68979257 is about 410.1154879900.

The spelling of 68979257 in words is "sixty-eight million, nine hundred seventy-nine thousand, two hundred fifty-seven".